Soil reaction pH

Interpretation

< 4.5

Extremely acid

4.5 - 5.0

Very strongly acid

5.1 - 5.5

Strongly acid

5.6 - 6.0

Moderately acid

6.1 - 6.5

Slightly acid

6.6 - 7.3

Neutral

7.4 - 7.8

Slightly alkaline

7.9 - 8.4

Moderately alkaline

8.5 - 9.0

Strongly alkaline

> 9.0

Very strongly alkaline